1/* console.c: Routines that deal with sending and receiving IO
2 *            to/from the current console device using the PROM.
3 *
4 * Copyright (C) 1995 David S. Miller (davem@davemloft.net)
5 * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
6 */
7
8#include <linux/types.h>
9#include <linux/kernel.h>
10#include <linux/sched.h>
11#include <asm/openprom.h>
12#include <asm/oplib.h>
13#include <linux/string.h>
14
15static int __prom_console_write_buf(const char *buf, int len)
16{
17	unsigned long args[7];
18	int ret;
19
20	args[0] = (unsigned long) "write";
21	args[1] = 3;
22	args[2] = 1;
23	args[3] = (unsigned int) prom_stdout;
24	args[4] = (unsigned long) buf;
25	args[5] = (unsigned int) len;
26	args[6] = (unsigned long) -1;
27
28	p1275_cmd_direct(args);
29
30	ret = (int) args[6];
31	if (ret < 0)
32		return -1;
33	return ret;
34}
35
36void prom_console_write_buf(const char *buf, int len)
37{
38	while (len) {
39		int n = __prom_console_write_buf(buf, len);
40		if (n < 0)
41			continue;
42		len -= n;
43		buf += len;
44	}
45}
46